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MathGroup Archive 2007

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Re: functional programming

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75177] Re: functional programming
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 19 Apr 2007 04:36:08 -0400 (EDT)
  • References: <f04n9k$8ec$1@smc.vnet.net>


Hi Raj,

you can not use 2 pure function in abreviated form (#&)in the same 

expression because then it is not clear to which function the argument # 

belongs. Therefore, for at least one function you must use the verbatime 

form Function[..,..]:

var=1280;

Select[{{35,38},{2064,2068},{2182,2183}},Function[x,#-1281<=x[[2]]<=1280]]&/@ 

{1280,2000}

hope this helps, Daniel



Raj wrote:

> Could somebody tell me how to do this

> 

> tsome = {{35, 38}, {2064, 2068}, {2182, 2183}};

> Select[tsome, 1280 - 1281 =E2=89=A4 #[[2]] =E2=89=A4 1280 &]

> 

> Now instead of using 1280 in the Select function, I want to use a

> variable and get the values as this variable varies. I know that a

> Table can be used and the value of the variable can be varied. But if

> possible, I want to do it in a "Truly functional way".

> 

> for example something like

> 

> Select[tsom, var-1281<=#[[2]]<=1280&]&/@{list of values over which the

> variable varies}

> 

> Thanks,

> 

> Raj

> 

> 




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